WO2003003108A1 - Ecran lcd et procede de fabrication correspondant - Google Patents

Ecran lcd et procede de fabrication correspondant Download PDF

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Publication number
WO2003003108A1
WO2003003108A1 PCT/JP2002/006578 JP0206578W WO03003108A1 WO 2003003108 A1 WO2003003108 A1 WO 2003003108A1 JP 0206578 W JP0206578 W JP 0206578W WO 03003108 A1 WO03003108 A1 WO 03003108A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal display
display panel
substrate
insulating
Prior art date
Application number
PCT/JP2002/006578
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
Kanetaka Sekiguchi
Original Assignee
Citizen Watch Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Citizen Watch Co., Ltd. filed Critical Citizen Watch Co., Ltd.
Priority to US10/450,711 priority Critical patent/US7019809B2/en
Priority to JP2003509229A priority patent/JP4181495B2/ja
Publication of WO2003003108A1 publication Critical patent/WO2003003108A1/ja

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals

Definitions

  • the present invention relates to a liquid crystal display panel characterized by a structure for preventing electrolytic corrosion in an extraction electrode for applying an electric signal to an electrode forming a pixel portion, and a method for manufacturing such a liquid crystal display panel.
  • a liquid crystal display panel is used in which a pixel portion is formed by electrodes and an extraction electrode for applying an electric signal to at least the electrode forming the pixel portion on the first substrate.
  • display is performed by controlling the ON / OFF of the pixels by changing the optical characteristics of the liquid crystal layer by an electric signal applied to an electrode forming a pixel portion.
  • Fig. 41 is a plan view of the conventional liquid crystal display panel
  • Fig. 42 is a cross-sectional view taken along line 42-42 shown in Fig. 41
  • Fig. 43 is a part (circle) of Fig. 41.
  • (In C) is an enlarged plan view of a portion enlarging.
  • this liquid crystal display panel has m strip-shaped first electrodes 2 provided on a first substrate 1 and n strips provided on a second substrate 6.
  • Matrix-type liquid crystal having a tripe-shaped second electrode 7 and having a display area 23 composed of mxn pixel sections 24 which are intersections of the first electrode 2 and the second electrode 7 It is a display panel.
  • the first substrate 1 and the second substrate 6 are opposed to each other with a predetermined gap provided by a spacer (not shown), and adhered by a sealing material 26 as shown in FIG. Enclose 25 and seal with sealing material 27 to ensure airtightness. Further, as shown in FIG.
  • a reflector 16 made of an aluminum film or a silver alloy film is provided on the second substrate 6, and red (R) color filters 17, 17 are provided on the reflector 16.
  • a color filter consisting of a green (G) color filter 18 and a blue (B) color filter 19 is provided on top of that.
  • a flattening protective film 21 is provided to flatten the unevenness of the color filter and to prevent an electrical short circuit between the reflector 16 and the second electrode 7. It is provided on the protective film 21.
  • an alignment film (not shown) is provided on the first electrode 2 and the second electrode 7 to align the liquid crystal molecules of the liquid crystal layer 25 in a predetermined direction.
  • the first substrate 1 is made larger in size than the second substrate, and the driving integration for applying a driving signal to the first electrode 2 is performed.
  • a circuit (IC) 36 and a drive IC 35 for applying a drive signal to the second electrode 7 are mounted on the first substrate 1. Note that the second substrate 6 is larger than the display area 23 and does not reach the area on the first substrate 1 where the drive ICs 35 and 36 are provided.
  • an extraction electrode continuous with the first electrode 2 for connecting the first electrode 2 and the driving IC 36 is drawn out of the display region 23 to the outside of the sealing material 26, and a polymer is placed on this.
  • a drive IC 36 is mounted via an anisotropic conductive film containing conductive particles in imid resin, and is heated and compressed to cure the film, thereby driving the first electrode 2 via an extraction electrode. Connected to the dynamic IC 36.
  • An extraction electrode 41 for connecting the second electrode 7 to the driving IC 35 is also provided on the first substrate, and a part of the sealing material 26 is formed by mixing conductive particles into acrylic resin.
  • the second electrode 6 provided on the second substrate 6 is formed by pressing the second substrate 6 and the first substrate 1 through the anisotropic conductive sealing material. 7 and the extraction electrode 41 provided on the first substrate 1 are electrically connected via conductive particles.
  • FIG. 43 A flexible printed circuit board (FPC) 31 is provided to connect to the drive ICs 35 and 36 via the connection electrodes 42 shown in Fig. 3.
  • the connection between the FPC 31 and the driving ICs 35 and 36 and the connection electrodes 42 is made by an anisotropic conductive film.
  • a portion where the extraction electrode 41 is provided on the first substrate 1 generates a potential difference between the adjacent extraction electrodes 41.
  • An insulating resin 32 is applied to prevent dirt and moisture from adhering.
  • an epoxy resin with low moisture permeability or a silicone resin with low moisture adsorption is used as the insulating resin 32.
  • connection electrode 42 for connecting to the FPC 31 can make the electrode width and the gap between the electrodes wider than the extraction electrode 41, so that the structure can be made relatively insensitive to electrolytic corrosion.
  • the extraction electrode 41 is susceptible to electrolytic corrosion because the width of the electrode and the gap between the electrodes must be reduced in order to increase the pixel density of the display region 23.
  • connection structure shown in FIG. 44 is known as a connection structure for preventing intrusion of moisture into the connection portion.
  • This flat display panel is a thin-film EL (electroluminescent) display panel.
  • the extraction electrode 94 provided on the glass substrate 91 and the FPC 95 are bonded and connected with solder 96, A region including the connection portion on the glass substrate 91 is filled with a resin 97, and a protective glass plate 98 is disposed on the resin 97.
  • the protective glass plate 98 on the resin 97 By providing the protective glass plate 98 on the resin 97 in this manner, the area where the resin 97 comes into contact with air is reduced, moisture is prevented from entering the extraction electrode 94, and corrosion of the extraction electrode 94 is prevented. Can be prevented.
  • An object of the present invention is to solve such a problem and to greatly reduce the occurrence of electrolytic corrosion in the extraction electrode by a simple method while keeping the size and weight of a conventional liquid crystal display panel almost constant. I do. Disclosure of the invention
  • a first substrate and a second substrate are opposed to each other with a predetermined gap therebetween, and a liquid crystal layer is sealed in the gap with a sealing material.
  • a pixel portion is formed by electrodes provided on the first substrate and the second substrate so as to face each other with a liquid crystal layer interposed therebetween; and an electrode for forming the pixel portion on at least the first substrate
  • a liquid crystal display panel provided with an extraction electrode for applying an electric signal to the liquid crystal display panel, wherein at least the sealing material of the extraction electrode also covers an outer part, and is connected to the second substrate.
  • An insulating coating material is provided so as to partially overlap.
  • an integrated circuit element is mounted on the extraction electrode, and the insulating coating material is provided also on the integrated circuit element.
  • a flexible connection board connected to the integrated circuit element, and to provide the insulating coating material on at least a part of the flexible connection board.
  • the insulating coating material is provided on both surfaces of the flexible connection substrate, also provided on the side surface of the second substrate, or on the side surface of the first substrate or the surface of the first substrate provided with the extraction electrode. May also be provided on the surface on the opposite side.
  • a polarizing plate is provided on at least one of the first substrate and the second substrate, and the insulating coating material is provided on the polarizing plate or between the polarizing plate and the substrate provided with the polarizing plate. It may be installed.
  • a reflection layer may be provided on one of the first substrate and the second substrate.
  • an insulating resin may be provided on the insulating coating material. Further, a second insulating covering material may be provided on the insulating resin.
  • the insulating coating material is preferably an insulating layer formed in a vacuum state, and is preferably an insulating layer containing silicon or an insulating layer made of a metal oxide.
  • the insulating coating material be thinner than the liquid crystal layer.
  • the insulating coating material may have a structure in which two or more different insulating films are stacked.
  • the insulating coating material has a thickness of 200 to 500 nm.
  • an insulating resin is provided so as to cover at least an outer portion of the sealing material of the extraction electrode, and the insulating coating is further provided thereon. It is provided with a material.
  • Such a liquid crystal display panel has a portion where the first substrate, the insulating resin, the second substrate, and the insulating covering material overlap each other when viewed from the first substrate side. It is good to do so.
  • first substrate and the insulating coating material are bonded with the insulating resin, or the insulating coating material is bonded with both the first substrate and the second substrate with the insulating resin. Or you may.
  • an integrated circuit element may be mounted on the extraction electrode, and the insulating resin may be provided between the integrated circuit element and the sealing material. Further, the insulating covering material may have a portion overlapping with each of the insulating resin, the integrated circuit element, and the second substrate as viewed from the first substrate side, or the insulating covering material may be provided. It is preferable to make contact with both the integrated circuit element and the second substrate.
  • the insulating coating material may have a portion that overlaps with each of the insulating resin, the second substrate, and the flexible connection substrate.
  • a flexible connection substrate directly connected to the extraction electrode may be provided.
  • the insulating covering material has a portion that overlaps with each of the insulating resin, the second substrate, and the flexible connection substrate when viewed from the first substrate side.
  • the insulating resin is made of at least two kinds of resins, and the insulating coating material has a thermal expansion coefficient equivalent to that of the first substrate or the second substrate. It is good to take things.
  • a polarizing plate may be provided, and the polarizing plate may be used as the insulating coating material.
  • the insulating coating may be provided so as to be in contact with the polarizing plate.
  • the insulating coating may be provided so as to be in contact with the polarizing plate.
  • the insulating coating material may be formed of glass, plastic, ceramics, or a metal material. Further, it is preferable to provide a gas barrier layer or a moisture barrier.
  • a second insulating covering material may be provided on the insulating covering material, and the second insulating covering material may be an anodic oxide layer of the metal material.
  • the insulating resin may be an epoxy resin, an ultraviolet curable resin, or a silicon resin, and may have a light absorbing material.
  • the insulating covering material has a surface perpendicular to the first substrate in contact with the insulating resin.
  • the opening is provided in a portion that does not overlap with the extraction electrode. Further, it is preferable that the opening is an opening for introducing the insulating resin, and the opening has a structure in which the insulating resin is raised.
  • the insulating coating may have a U-shaped cross section, and may be provided so that the first substrate is in contact with the inside of the U-shape.
  • the insulating covering material may be in contact with at least two of the top, bottom, left, right, front and rear surfaces of the first substrate, or a substrate for fitting the first substrate to the insulating covering material. It is preferable to provide a groove for the liquid crystal panel, provide a flexible connection substrate for connecting the liquid crystal display panel to an external circuit, and provide an opening for passing the flexible connection substrate in the insulating coating material.
  • a flexible connection board for connecting the liquid crystal display panel to an external circuit may be provided, and the insulating resin may be provided on at least a part of both sides of the flexible connection board.
  • the insulating covering material is a black member, and the insulating covering material is It may be used as a parting-off provided on the outer periphery of the display area configured by the above.
  • a flexible connection board for connecting the liquid crystal display panel to an external circuit may be provided, and a part of the flexible connection board may be used as the insulating covering material.
  • the outer shape of the second substrate and the outer shape of the sealing material match at least on the side where the extraction electrode is drawn out of the sealing material.
  • a second insulating coating may be provided on the insulating coating.
  • an integrated circuit element is mounted on the extraction electrode, the insulating coating material is also provided on the integrated circuit element, and the integrated circuit element is colored black.
  • At least a part of the outer periphery of the region where the insulating resin is provided may be provided with an outer peripheral wall for preventing the outflow of the insulating resin.
  • the insulating coating material be provided in a plurality of pieces.
  • the insulating coating material preferably has a thickness of 80 to 150 m.
  • the first substrate and the second substrate are opposed to each other with a predetermined gap provided therebetween, a liquid crystal layer is sealed in the gap with a sealing material, and the liquid crystal layer is formed.
  • a pixel portion is formed by electrodes provided on the first substrate and the second substrate so as to face each other with an electric signal interposed therebetween, at least on the electrode forming the pixel portion on the first substrate.
  • a step of disposing a polarizing plate on the first substrate or the second substrate may be provided before the step of disposing the insulating coating material.
  • the step may be a step of curing the insulating resin and the low-viscosity insulating resin.
  • At least a portion of the gap between the first substrate and the second substrate, which is outside the sealing material, has a low viscosity lower than the insulating resin. It is preferable to provide a low-viscosity insulating resin application step of applying an insulating resin.
  • a low-viscosity insulating resin curing step of curing the low-viscosity insulating resin may be provided between the low-viscosity insulating resin applying step and the resin applying step.
  • the outer peripheral wall for preventing the outflow of the insulating resin is provided at least at a part of the outer periphery of the region to which the insulating resin is to be applied before the resin applying step. It is preferable to provide an outer peripheral wall installation step of providing the above.
  • the method for manufacturing a liquid crystal display panel according to the present invention also includes a step of providing the first substrate and the second substrate to face each other with a predetermined gap therebetween, sealing a liquid crystal layer in the gap with a sealing material, A pixel portion is formed by electrodes provided on the first substrate and the second substrate so as to face each other, and an electric signal is formed on at least the electrode forming the pixel portion on the first substrate.
  • the insulating coating material forming step may be performed at a temperature of 150 ° C. or less.
  • the polarizing plate disposing step is a step of disposing a polarizing plate having a protective film
  • a step of removing the protective film of the polarizing plate may be provided after the step of forming the insulating coating material.
  • At least a region where the insulating coating material is to be provided such as an oxygen gas, an inert gas such as argon gas, an oxygen gas, or the like. It is preferable to provide a step of performing treatment using any one of nitrogen and nitrogen gas or a mixed gas of two or more of them.
  • the liquid crystal display panel of the present invention has a structure in which at least the extraction electrode provided on the first substrate is drawn from the inside of the sealing material enclosing the liquid crystal layer to the outside.
  • This also employs a structure in which an insulating covering material of a thin-film insulating layer is provided so as to cover the outer portion and partially overlap the second substrate.
  • a film which is dense without water permeability and can be formed at 100 to 200 ° C. is preferably used.
  • this thin-film insulating layer is formed not only on the extraction electrode, but also on the integrated circuit element and on the side surfaces, and also on the boundary between the extraction electrode and the integrated circuit element, the penetration of moisture can be further prevented. .
  • TAB tape quote carrier bonding
  • FPC flexible printed circuit board
  • plastic board connects the circuit board that forms the circuit on a flexible connection board (flexible printed circuit board: FPC) or plastic board to the first board or the second board.
  • FPC flexible printed circuit board
  • the water permeability can be extremely low.
  • an insulating resin made of epoxy resin or silicon resin on the thin film insulating layer, physical damage to the thin film insulating layer can be prevented, and prevention of electrolytic corrosion can be enhanced.
  • silicon nitride film silicon oxide film
  • a thin film insulating layer made of a metal oxide such as a tantalum oxide film or a titanium oxide film can be used to form a dense film at a low temperature, so that a substrate or a mounting member having a low heat-resistant temperature is used. It becomes possible.
  • ultraviolet light When such a film is formed, ultraviolet light may be generated.
  • a polarizing plate having an ultraviolet light-cutting layer and then providing a thin-film insulating layer, the generated ultraviolet light can be generated.
  • Can protect the liquid crystal layer so that the thin film insulating layer can be formed without particularly protecting the liquid crystal layer.
  • the thin film insulating layer in such a procedure and providing the thin film insulating layer also on the polarizing plate, it is possible to prevent moisture from penetrating into the polarizing plate, so that the reliability of the polarizing plate is improved. Can be improved.
  • the thin-film insulating layer is formed by vacuum sputtering or CVD, the surface of the sealing material or sealing material that seals the liquid crystal layer can be covered with the thin-film insulating layer, so that moisture can penetrate into the liquid crystal layer. Can be prevented, the reliability of the liquid crystal display panel can be improved, and the display quality can be kept constant.
  • the liquid crystal is formed by these members. Irradiation of ultraviolet rays to the layer can be prevented, and it is not necessary to particularly limit the portion where the thin film insulating layer is formed. Therefore, by forming a thin film insulating layer on the display surface, the formation of the thin film insulating layer is simplified. .
  • the water permeability of the substrate can be reduced by the thin-film insulating layer, thereby preventing the penetration of moisture into the liquid crystal layer, which is more effective. Furthermore, if a thin-film insulating layer is formed on both the first substrate and the second substrate, almost all surfaces of the plastic substrate can be covered with the thin-film insulating layer, so that reliability can be improved.
  • the glass substrate, plastic substrate, or surface is insulated to prevent the thin film insulating layer from being damaged and to improve the hydrophobicity of the extraction electrode.
  • a second insulating covering material made of the covering material is provided in a portion overlapping with the lead-out electrode on which the thin film insulating layer is formed. If the coating material is thicker than the thin-film insulating layer, the water permeability can be greatly reduced, and even if a scratch or the like occurs due to external force, it will not penetrate easily and maintain a state with low water permeability. Becomes possible.
  • a method of forming an insulating film on the first substrate 1 in advance may be considered.
  • an insulating film is formed before a so-called cell forming step in which a predetermined gap is provided between the second substrate and a liquid crystal layer is sealed by bonding with a sealing material, the bump electrode of the driving integrated circuit and the first substrate (1)
  • this process requires printing accuracy because it requires positional accuracy. Difficult to do. Therefore, a photolithography process and an etching process are required, which leads to an increase in cost.
  • the insulating covering material of the thin film insulating layer used in the present invention does not require such a photolithography step or an etching step, and can be easily formed to prevent electrolytic corrosion.
  • a configuration in which a coating material is provided as the above-described insulating coating material is also employed.
  • an insulating resin is provided so as to cover at least a portion of the extraction electrode outside the sealing material, and a coating material is provided thereon.
  • a plastic plate having a predetermined thickness, a glass plate, A metal plate, a substrate provided with an anodized layer as a second insulating coating on the metal plate, a ceramic plate, or a laminated adhesive can be used. Since these materials have extremely low water permeability and are not films to be applied like insulating resins, the generation of bubbles and pinholes can be extremely reduced.
  • a gas barrier layer such as a silicon oxide film, a silicon nitride film, or an aluminum oxide film, or a moisture barrier film made of a moisture barrier layer is provided to prevent moisture from penetrating into the extraction electrode. Can be reduced.
  • the second substrate If the coating material is provided using the screen and the IC as a partition, the gap between the first substrate and the coating material can be made constant. Also, by applying an insulating resin to the surface opposite to the surface in contact with the extraction electrode of IC and the second substrate and bonding the coating material, the coating material can be held firmly.
  • a conductive film such as a transparent conductive film
  • a coating material is provided on the extraction electrode and on the anisotropic conductive film to allow the FPC to be in contact with the FPC. Electrical corrosion of the part can be prevented at the same time.
  • the first insulating resin is applied on the extraction electrode provided on the first substrate, and the surface to be bonded to the coating material, that is, the first insulating resin and the coating material are provided between the first insulating resin and the coating material. If a second insulating resin having characteristics different from that of the insulating resin is applied, as the first insulating resin on the first substrate side, a resin having a large stress and cannot be thickly coated or a coating material is used. For this reason, it is possible to use insulating resins that have a very long curing time. Further, as the second insulating resin, an insulating resin that cures in a very short time, such as an ultraviolet curing type, can be used.
  • the light absorbing IC Power consumption and malfunction can be prevented. Furthermore, by using a material having a light-shielding property as the covering material, the light entry path to the IC in the liquid crystal display panel can be extremely limited.
  • the gap between the first substrate, the second substrate, and the sealing material near the sealing material is formed by the first insulating resin. It is also preferable to provide a second insulating resin having a low viscosity. In this case, while the bank is formed around the first insulating resin having high viscosity, the second insulating resin having low viscosity can be surely penetrated into the gaps and can be bonded to the covering material.
  • a coating protective material is provided on the outer peripheral portion of the first substrate, which is close to the coating material, partially overlaps the first substrate, and has a surface also in the cross-sectional side wall direction of the first substrate. It is possible to prevent sagging and to reduce non-application of the insulating resin in the gap between the first substrate and the second substrate.
  • FIG. 1 is a plan view of a liquid crystal display panel according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
  • FIG. 3 is a partially enlarged plan view showing a circle A in FIG. 1 in an enlarged manner.
  • FIG. 4 is a cross-sectional view corresponding to FIG. 2 showing a cross-section of a liquid crystal display panel according to a second embodiment of the present invention.
  • FIG. 5 is a partially enlarged plan view corresponding to FIG. 3 showing the vicinity of the extraction electrode in an enlarged manner.
  • FIG. 6 is a cross-sectional view corresponding to FIG. 4 showing a configuration of a modified example of the liquid crystal display panel of the second embodiment of the present invention.
  • FIG. 7 corresponds to FIG. 2 showing a cross section of a liquid crystal display panel according to a third embodiment of the present invention.
  • FIG. 7 corresponds to FIG. 2 showing a cross section of a liquid crystal display panel according to a third embodiment of the present invention.
  • FIG. 8 is a cross-sectional view corresponding to FIG. 2 showing a cross-section of a liquid crystal display panel according to a fourth embodiment of the present invention.
  • FIG. 9 is a plan view of a liquid crystal display panel according to a fifth embodiment of the present invention.
  • FIG. 10 is a cross-sectional view taken along line 10-10 of FIG.
  • FIG. 11 is a cross-sectional view taken along line 11--11 of FIG.
  • FIG. 12 is a cross-sectional view corresponding to FIG. 2 showing a cross-section of a liquid crystal display panel according to a sixth embodiment of the present invention.
  • FIG. 13 is a cross-sectional view corresponding to FIG. 2 showing a cross-section of a liquid crystal display panel according to a seventh embodiment of the present invention.
  • FIG. 14 is a plan view of a liquid crystal display panel according to an eighth embodiment of the present invention.
  • FIG. 15 is a cross-sectional view taken along the line 15--15 in FIG.
  • FIG. 16 is a partially enlarged plan view showing a circle B in FIG. 14 in an enlarged manner.
  • FIG. 17 is a sectional view corresponding to FIG. 15 showing a section of a liquid crystal display panel according to a ninth embodiment of the present invention.
  • FIG. 18 is a cross-sectional view corresponding to FIG. 15 showing a cross-section of the liquid crystal display panel of the tenth embodiment of the present invention.
  • FIG. 19 is a cross-sectional view corresponding to FIG. 15 showing a cross-section of the liquid crystal display panel of the eleventh embodiment of the present invention.
  • FIG. 20 is a partially enlarged plan view corresponding to FIG. 16 showing a part of the liquid crystal display panel of the 12th embodiment of the present invention.
  • FIG. 21 is a partial cross-sectional view showing a part of the cross section taken along line 21--21 of FIG. 20 upside down.
  • FIG. 22 is a sectional view corresponding to FIG. 15 showing a section of the liquid crystal display panel of the thirteenth embodiment of the present invention.
  • FIG. 23 is a cross-sectional view of a liquid crystal display panel according to a fifteenth embodiment of the present invention.
  • FIG. 24 is a perspective view showing the shape of a covering material provided on the liquid crystal display panel.
  • FIG. 25 is a partially enlarged plan view corresponding to FIG. 16 showing a part of the liquid crystal display panel of the fifteenth embodiment of the present invention.
  • FIG. 26 is a sectional view corresponding to FIG. 15 showing a section of a liquid crystal display panel according to a fifteenth embodiment of the present invention.
  • FIG. 27 is a plan view of the liquid crystal display panel of the sixteenth embodiment of the present invention.
  • FIG. 28 is a cross-sectional view taken along line 28-28 of FIG.
  • FIG. 29 is a cross-sectional view corresponding to FIG. 15 showing a cross-section of a liquid crystal display panel of a seventeenth embodiment of the present invention.
  • FIG. 30 is a sectional view corresponding to FIG. 15 showing a section of a liquid crystal display panel of an eighteenth embodiment of the present invention.
  • FIG. 31 is a plan view of a liquid crystal display panel according to a ninth embodiment of the present invention.
  • FIG. 32 is a plan view of a liquid crystal display panel according to a 20th embodiment of the present invention.
  • FIG. 33 is a cross-sectional view taken along line 33-33 in FIG.
  • FIG. 34 is a plan view of the liquid crystal display panel of the twenty-first embodiment of the present invention.
  • FIG. 35 is a cross-sectional view taken along line 35-35 of FIG.
  • FIG. 36 is a cross-sectional view corresponding to FIG. 35 showing a configuration of a modification of the liquid crystal display panel of the twenty-first embodiment of the present invention.
  • FIG. 37 is a plan view of a liquid crystal display panel according to a second embodiment of the present invention.
  • FIG. 38 is a cross-sectional view corresponding to FIG. 15 showing a cross-section of a first modification of the liquid crystal display panel of the present invention.
  • FIG. 39 is a cross-sectional view corresponding to FIG. 2 showing a cross-section of a second modification of the liquid crystal display panel of the present invention.
  • FIG. 40 is a cross-sectional view corresponding to FIG. 15 showing a cross-section of a third modification of the liquid crystal display panel of the present invention.
  • FIG. 41 is a plan view of a conventional liquid crystal display panel.
  • FIG. 42 is a cross-sectional view taken along line 42-42 of FIG.
  • FIG. 43 is a partially enlarged plan view showing the inside of a circle C of FIG. 41 in an enlarged manner.
  • FIG. 44 is a cross-sectional view of another conventional liquid crystal display panel. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIGS. 1 to 3 First Embodiment: FIGS. 1 to 3
  • FIG. 1 is a plan view of the liquid crystal display panel
  • FIG. 2 is a sectional view taken along line 2-2 shown in FIG. 1
  • FIG. 3 is a partially enlarged plan view enlarging a circle A ⁇ in FIG. .
  • the liquid crystal display panel of the first embodiment is a reflective liquid crystal display panel used for a mobile phone, a small information device, a clock, and the like.
  • the feature of the first embodiment is that the liquid crystal display panel is provided on a first substrate.
  • a thin-film insulating layer is provided as an insulating coating material on the extraction electrode and its surroundings, on the drive integrated circuit (IC) of the liquid crystal display panel, on the flexible printed circuit board (FPC), and on the second substrate. It is.
  • this liquid crystal display panel has m stripe-shaped first electrodes 2 provided on a 0.5 mm-thick first substrate 1 and a 0.5 mm-thick first electrode 2. It has n stripe-shaped second electrodes 7 provided on the second substrate 6, and has m ⁇ n pixel sections 2 which are intersections of the first electrodes 2 and the second electrodes 7.
  • This is a Matritas-type liquid crystal display panel having a display area 23 composed of four.
  • the first substrate 1 and the second substrate 6 are opposed to each other with a predetermined gap provided by a spacer (not shown), and adhered by a sealing material 26 as shown in FIG. Enclose 25 and seal with sealing material 27 to ensure airtightness.
  • a reflector 16 made of an aluminum film or a silver alloy film is provided on the entire surface of the second substrate 6, and a red (R) color filter 1 is provided on the reflector 16.
  • a color filter consisting of a green (G) color filter 18 and a blue (B) color filter 19 is provided.
  • a flattening protective film 21 is provided thereon to flatten the unevenness of the color filter and to prevent an electrical short circuit between the reflector 16 and the second electrode 7. It is provided on the flattening protective film 21.
  • an alignment film (not shown) is provided on the first electrode 2 and the second electrode 7 to align the liquid crystal molecules of the liquid crystal layer 25 in a predetermined direction.
  • the polarizing plate 11 is a normal absorption-type polarizing plate in which one deflection axis is an absorption axis and a deflection axis orthogonal to the one is a transmission axis.
  • the retardation plate 12 in addition to a single-layer retardation plate, a laminate of two or three retardation plates can be used to improve display contrast / brightness.
  • the polarizing plate 11, the phase difference plate 12, the reflection plate 16, each color filter, the flattening protective film 21, and the connection electrode 42 are not shown.
  • the extraction electrode 41 is not denoted by a reference numeral because it is difficult to indicate the boundary between the first electrode 2 and the second electrode 7, but at least the sealing material 2
  • the portion outside 6 is the extraction electrode 41. The same applies to a plan view corresponding to this used in the description of the embodiment below.
  • the first substrate 1 has a larger size than the second substrate 6 and a driving IC for applying a driving signal by an electric signal to the first electrode 2.
  • 36 and a drive IC 35 for applying a drive signal based on an electric signal to the second electrode 7 are mounted on the first substrate 1.
  • the second substrate 6 is larger than the display area 23 and has a size that does not reach the area where the driving ICs 35 and 36 on the first substrate 1 that is an integrated circuit element are provided.
  • an extraction electrode continuous with the first electrode 2 for connecting the first electrode 2 and the driving IC 36 is drawn out of the display region 23 to the outside of the sealing material 26, and a polymer is placed on this.
  • the drive IC 36 is mounted via an anisotropic conductive film containing conductive particles in the imid resin, and is heated and compressed to cure the film, thereby driving the first electrode 2 via the extraction electrode. It is connected to the dynamic IC 36.
  • Such a mounting method is called a chip-on-glass (COG) method.
  • an extraction electrode 41 for connecting the second electrode 7 and the driving IC 35 is also provided on the first substrate, and a part of the sealing material 26 is anisotropically mixed with conductive particles in acryl resin.
  • the second substrate 6 and the first substrate 1 are made of a conductive sealing material, and are pressurized through the anisotropic conductive sealing material to form a second electrode 7 provided on the second substrate 6.
  • the lead electrode 41 provided on the first substrate 1 is electrically connected via conductive particles.
  • the driving ICs 35 and 36 are separately mounted on the two sides of the liquid crystal display panel, but all the driving ICs may be mounted on one side by drawing out the extraction electrodes.
  • a flexible connection board connected to the drive ICs 35 and 36 via the connection electrodes 42 shown in FIGS. 2 and 3 is used.
  • the connection between the FPC 31 and the driving ICs 35 and 36 and the connection electrode 42 is performed by an anisotropic conductive film.
  • an insulating coating material is formed on and around the extraction electrode 41 so as to cover at least the entire portion of the extraction electrode 41 outside the sealing material 26.
  • a moisture-impermeable thin film insulating layer 22 made of silicon nitride (SiN x) is formed with a thickness of 250 nm (nanometers), and is formed on the driving ICs 35, 36 and the FPC 31.
  • the thin film insulating layer 22 is similarly formed on the portion between the driving IC 35 and the FPC 31 and on the entire surface of the second substrate 6 on the side opposite to the liquid crystal layer 25 (the lower surface in FIG. 2). Has formed.
  • the thin film insulating layer 22 covers the entire surface. Therefore, it is possible to prevent moisture from penetrating into the extraction electrode 41, and to prevent the extraction electrode 41 from being electrically eroded even when operated for a long time in a high-temperature and high-humidity state, and to perform stable display.
  • the thin film insulating layer 22 is formed on the second substrate 6 Therefore, the distance from the end of the thin film insulating layer 22 to the extraction electrode 41 is long, and the penetration of moisture from the end to the extraction electrode 41 can be eliminated.
  • the thin-film insulating layer 22 is provided on the entire surface of the second substrate 6 here, this effect can be exerted only by providing the thin-film insulating layer 22 so as to partially overlap the second substrate 6.
  • the thin film insulating layer 22 can be used with a film quality formed by normal pressure chemical vapor deposition (CVD) or normal pressure light CVD.
  • CVD normal pressure chemical vapor deposition
  • a dense film is necessary in order to prevent electrolytic corrosion of the extraction electrode 41, and when formed by sputtering and CVD under a vacuum state, the film can be dense and have low water permeability. Its use is particularly effective. It is also particularly effective to repeat the processes of film formation, cleaning, and film formation a plurality of times, since the occurrence of pinholes in the film can be prevented.
  • the thin film insulating layer 22 is preferably formed at 150 ° C. or lower. This is for preventing the liquid crystal layer 25 from deteriorating at an excessively high temperature. In order to prevent the deterioration of the polarizing plate 11 and the FPC 31, it is preferable to form the film at a lower temperature, but a temperature of 150 ° C. or less is an allowable range.
  • the airtightness can be maintained by the driving ICs 35 and 36 and the thin film insulating layer 22 in the portion where the extraction electrode 41 is provided on the first substrate 1.
  • the lead electrode 41 and the drive IC 36 are coated on the side where the drive IC 36 is provided in the same manner as on the side where the drive IC 35 is provided. It is assumed that This is the same in the following embodiments.
  • the reflector 16 is provided so as to have the same outer circumference as the flattening protective film 21 up to the outer circumference of the second substrate 6.
  • the thin film insulating layer 22 is formed by the sealing material 26 or the second Since it is also provided on the side surface of the substrate 6, the outer peripheral portion of the reflector 16 is also provided with the thin-film insulating layer 22, and the reflector 16 does not come into contact with the outside air. Therefore, even when an aluminum (including alloy) film or a silver (including alloy) film is used for the reflection plate 16, it is possible to prevent the reflection plate 16 from being altered or corroded. It is not necessary to form the pattern 6 and the above-described structure that can simplify the process can be adopted.
  • the thin film insulating layer 22 can be formed even in a thin gap of about 5 micrometers (m) between the first substrate 1 and the second substrate 6. Accordingly, it is possible to cover the extraction electrode 41 with the thin-film insulating layer 22 even in the gap 53, which is the outer part of the sealing material 26 in the gap, and to prevent the extraction electrode 41 from contacting the outside air. Can be prevented. In order to sufficiently obtain this effect, it is preferable that the thin film insulating layer 22 be thinner than the distance between the first substrate 1 and the second substrate 6, that is, the thickness of the liquid crystal layer.
  • the film thickness is preferably from about 100 nm to about 500 nm. However, good results were obtained in the range of about 200 nm to about 500 nm.
  • a silicon oxide film also containing silicon or a single film or a laminated film of silicon nitride oxide film is formed and used in a vacuum state. Had the same effect.
  • a thin film insulating layer made of a metal oxide such as a tantalum oxide film or a titanium oxide film is employed, a dense film can be formed at a low temperature, which is preferable when a substrate or a mounting member having a low heat-resistant temperature is used. Met. Further, two or more different insulating films may be stacked.
  • the liquid crystal layer 25 remaining in the gap portion 53 is sufficiently cleaned, and after the driving ICs 35, 36 and the FPC 31 are mounted, the oxygen plasma is provided in the portion where the thin film insulating layer is provided.
  • the thin film insulating layer 22 is formed after performing the treatment, removing the residue and removing the dirt. If oxygen plasma treatment is performed before mounting the drive ICs 35 and 36, the extraction electrode 41 is formed. The surface of the transparent conductive film that is formed is altered (the degree of oxidation changes), and is not shown on the drive ICs 35 and 36. Poor conductivity with bumps. However, after the driving ICs 35 and 36 are mounted, the oxygen plasma treatment is possible, and the organic substances can be efficiently removed. Note that, instead of the oxygen plasma treatment, a plasma treatment using an inert gas such as an argon gas, an oxygen gas, a nitrogen gas, or a mixed gas of two or more of these may be performed.
  • an inert gas such as an argon gas, an oxygen gas, a nitrogen gas, or
  • the thin-film insulating layer 22 is also provided on the side of the sealing material 26 that comes into contact with the outside air, Since the amount of moisture permeating through the sealing material 26 can be reduced, the change in characteristics of the liquid crystal layer 25 can be reduced, and the display quality can be improved.
  • the thin-film insulating layer 22 is formed only on a part of the FPC 31. This is because an external circuit (not shown) is provided on the second substrate 6 side of the FPC 31. This is because a connection terminal is provided.
  • a portion where the thin film insulating layer 22 is not formed is covered with a polyimide tape in advance, and after the thin film insulating layer 22 is formed, the polyimide tape is applied. What is necessary is just to peel off. This method is also effective in that the electrode portion for connecting the FPC 31 to the external circuit can be protected in the process of forming the thin film insulating layer 22.
  • FIG. 4 is a cross-sectional view corresponding to FIG. 2 showing a cross-section of the liquid crystal display panel
  • FIG. 5 is a partially enlarged plan view corresponding to FIG.
  • FIG. 7 is a cross-sectional view corresponding to FIG. 4 showing the configuration of the modified example.
  • parts corresponding to those in the first embodiment are denoted by the same reference numerals.
  • the features of the second embodiment are that a thin-film insulating layer is provided as an insulating coating material on the entire surface of the second substrate (the lower side in FIG. 4) of the FPC, and that a part of the thin-film insulating layer is insulated.
  • the point is that a conductive resin is provided.
  • the liquid crystal display panel of the second embodiment is different from the liquid crystal display panel of the first embodiment described above except that these points and the reflection plate 16 are formed in a pattern smaller than the second substrate 6. The description is omitted or simplified except for the differences.
  • the thin-film insulating layer 22 is formed on the extraction electrode 41 and its periphery, on the drive integrated circuit 35 and on the lower side of the second substrate 6 in FIG. On the surface of In addition, on the FPC 31, a thin-film insulating layer 22 is provided on the entire surface on the second substrate 6 side.
  • the FPC 31 side is also pulled from the end of the thin film insulating layer 22.
  • the distance to the extraction electrode 41 it is possible to more effectively eliminate the penetration of moisture from the end into the extraction electrode 41.
  • a thin-film insulating layer 2 is provided on the portion of the extraction electrode 41 outside the sealing material 26, its periphery and the portion corresponding to the driving ICs 35, 36 and a part of the flexible printed circuit board 31.
  • An insulating resin 32 made of silicon resin is provided on 2.
  • Epoxy resin is preferable in terms of low water permeability, but epoxy resin undergoes large heat shrinkage, and the heat shrinkage causes deformation of the substrate, which changes the thickness of the liquid crystal layer 25 near the sealing material 26. Because of the danger, a silicon resin that has small heat shrinkage and elasticity is used here.
  • the insulating resin 32 has the function of preventing moisture from penetrating into the electrodes such as the extraction electrode 41 in order to prevent electrolytic corrosion, but also prevents the thin film insulating layer 22 from being damaged. It is also used to reinforce the adhesion between the FPC 31 and the first substrate 1.
  • the infiltration of moisture can be prevented in cooperation with the thin-film insulating layer 22 and the thin-film insulating film 22 can be prevented from being damaged and its function can be exhibited stably. Therefore, it is possible to prevent electrolytic corrosion of the extraction electrode 41.
  • the connection between the FPC 31 and an external circuit is made on the first substrate 1 side (the upper side in FIG. 4) of the FPC 31.
  • the formation is performed.
  • the thin film insulating layer 22 is mainly formed on the second substrate 6 side, the layer formed on the first substrate 1 side is extremely thin due to a roundabout.
  • Such a layer forms a terminal part with copper and gold, and can be mechanically destroyed when using a connector for connection to an external circuit, or thermally when using a connection by soldering. Therefore, connection was possible without any masking without masking. Therefore, the steps can be simplified by omitting the masking when forming the thin film insulating layer 22.
  • the thin film insulating layer 22 is formed only on the lower side of the first substrate 1 in the figure (on the side of the second substrate 6), but as shown in FIG.
  • the thin film insulating layer 22 is formed only on the lower side of the first substrate 1 in the figure (on the side of the second substrate 6), but as shown in FIG.
  • the thin film insulating layer 22 When the thin film insulating layer 22 is formed above the first substrate 1 in the figure, it can be formed directly on the first substrate 1 or after the polarizing plate 11 is bonded. It can also be formed on top. Fig. 6 shows the latter example. In terms of the reliability of the liquid crystal display panel, the latter was better. The reason is that the liquid crystal layer 25 can be protected from ultraviolet light generated when the thin film insulating layer 22 is formed by the polarizing plate 11 having an ultraviolet cut function.
  • FIG. 7 is a sectional view corresponding to FIG. 2 showing a section of the liquid crystal display panel.
  • parts corresponding to those of the first and second embodiments are denoted by the same reference numerals.
  • the feature of the third embodiment is that a second polarizing plate is provided on a second substrate, and a thin-film insulating layer is provided on the polarizing plate.
  • the liquid crystal display panel according to the third embodiment is the same as the above-described second embodiment except for these points and the point that the reflection plate 16 is not provided. Therefore, the description of the points other than the differences is omitted. Or simple. As shown in FIG. 7, this liquid crystal display panel does not have a reflector, and a second polarizer 14 is provided on the back side (the lower side in the figure) of the second substrate 6.
  • an absorption type polarizing plate in which one polarization axis is a transmission axis and an orthogonal polarization axis is an absorption axis, or one of the polarization axes is a transmission axis, and One of the reflective polarizers whose polarization axis is the reflection axis is used.
  • bright display can be achieved by using a reflective polarizer.
  • the thin film insulating layer 22 is provided on the lead electrode 41 and its surroundings, on the drive integrated circuit 35, on the surface on the back side of the FPC 31 and the like, as in the second embodiment.
  • the thin-film insulating layer 22 is formed on the second substrate 6 not directly but via the second polarizing plate 14.
  • the liquid crystal layer 25 can be protected by the second polarizing plate 14 from ultraviolet rays generated during the process of forming the thin film insulating layer 22.
  • an ultraviolet reflecting material or an ultraviolet absorbing agent is mixed into the sealing material 26, the amount of ultraviolet irradiation to the liquid crystal layer 25 can be further reduced.
  • the thin-film insulating layer 22 can prevent electrolytic corrosion of the extraction electrode 41 in the same manner as in each of the above-described embodiments, and can prevent the second polarizing plate 14 Degradation can also be prevented. Further, the second polarizing plate 14 can prevent the liquid crystal layer 25 from being deteriorated when the thin film insulating layer 22 is formed.
  • the transflector is a thin film aluminum film or a film having holes (openings) for transmitting light, corrosion occurs due to moisture. By covering the transflector, Corrosion can be prevented.
  • the semi-transmissive reflector In this case, it is effective to prevent the corrosion of the cross section and the penetration of moisture into the adhesive layer by the thin film insulating layer 22 in this case.
  • FIG. 8 is a sectional view corresponding to FIG. 2 showing a section of the liquid crystal display panel.
  • parts corresponding to the first to third embodiments are denoted by the same reference numerals.
  • the fourth embodiment is the same as the third embodiment except for the place where the thin-film insulating layer is provided. Therefore, the description other than this point is omitted or simplified.
  • the thin-film insulating layer 22 is provided on and around the extraction electrode 41 and the drive integrated circuit 35 in the same manner as in the third embodiment. I have.
  • the thin film insulating layer 22 is provided only on a part of the outer peripheral portion.
  • the back side (the lower side in the figure) of the FPC 31 it is provided only near the outer peripheral portion of the first substrate 1.
  • Masking is performed in the step of providing the thin-film insulating layer 22 to limit the region where the thin-film insulating layer 22 is formed, so that the thin-film insulating layer 22 can be arranged in such a manner.
  • the reason for preventing variation in quality and providing only a part on the back side of the FPC 31 is that even if the FPC 31 is bent as shown in Fig. 8 and connected to an external circuit (not shown) This is to prevent the thin film insulating layer 22 from being provided at a bent portion on the FPC 31 so that the thin film insulating layer 22 does not peel off from the FPC 31.
  • FIGS. 9 to 11 [Fifth Embodiment: FIGS. 9 to 11]
  • FIG. 9 is a plan view of the liquid crystal display panel
  • FIG. 10 is a cross-sectional view taken along the line 10-10 shown in FIG. 9
  • FIG. 11 is a sectional view taken along the line 11-11 shown in FIG. It is sectional drawing.
  • parts corresponding to those in the first and second embodiments are denoted by the same reference numerals.
  • the feature of the fifth embodiment is that, in addition to the thin film insulating layer on the second substrate side of the panel (the lower side in FIGS. 10 and 11), the second substrate side (the upper side in FIG. The point is that a second thin-film insulating layer is provided as an insulating coating material.
  • This liquid crystal display panel has almost the same configuration as the liquid crystal display panel of the second embodiment described with reference to FIGS. 4 and 5, but first, in the second embodiment, the driving ICs 35, 3 6 is mounted on the first substrate 1, whereas a drive IC 36 for applying a drive signal to the second electrode 6 is mounted on the second substrate 6. This is different from the liquid crystal display panel of the second embodiment. Therefore, an extraction electrode for connecting the second electrode 7 and the driving IC 36 is also provided on the second substrate 6. Further, the driving IC 36 is connected to the FPC 13 1 for the driving IC 36 by a connection electrode 42 on the second substrate 6 not shown in FIG.
  • a second thin film insulating layer 122 is provided on the first substrate side of the panel. As shown in FIGS. 9 to 11, the second thin-film insulating layer 122 is formed on the extraction electrode 41 provided on the second substrate 6 and at least around the extraction electrode 41.
  • a water-impermeable film made of silicon nitride (SiNx) is formed with a thickness of 250 ⁇ (nanometers) so as to cover all parts outside the sealing material 26, and further, on the driving IC 36, The entire surface of the first substrate 1 side of the FPC 13 1, the portion between the driving IC 36 and the FPC 13 1, The same is formed on the entire surface of the first substrate 1 on the side opposite to the liquid crystal layer 25 (the upper side in FIGS. 10 and 11).
  • An insulating resin 32 made of a silicone resin is provided in a portion corresponding to.
  • the extraction electrode 4 1 on the second substrate is required only by the thin film insulating layer 22 provided on the second substrate 6 side of the panel. Therefore, it is important to provide a second thin-film insulating layer 122 also on the first substrate 1 side. By doing so, the connection electrodes provided on the second substrate 6 can also be prevented from permeating moisture and electrolytic corrosion.
  • the thin film insulating layer 22 and the second thin film insulating layer 122 can be provided at the same time.
  • the liquid crystal display panel may be rotated about the left-right direction in FIG. 10 during the formation of the thin-film insulating layer.
  • the second thin film insulating layer 122 is removed when the polarizing plate 111 needs to be repaired.
  • the second thin film insulating layer 122 is formed directly on the first substrate 1 because it must be removed, the second thin film insulating layer 122 is formed on the polarizing plate 111.
  • FIG. 12 is a sectional view corresponding to FIG. 2 showing a section of the liquid crystal display panel.
  • parts corresponding to those of the first and second embodiments are denoted by the same reference numerals.
  • a feature of the sixth embodiment is that a second thin-film insulating layer is provided as a second insulating coating material on the thin-film insulating layer and the insulating resin.
  • the liquid crystal display panel according to the sixth embodiment is substantially the same as the second embodiment described with reference to FIGS. 4 and 5 except for this point, and therefore, the description is omitted except for the difference. Or make it easy.
  • the thin film insulating layer 22 and the insulating resin 32 are provided as in the case of the second embodiment, but the insulating resin 32 is provided by acryl resin.
  • a second thin-film insulating layer 122 is further provided on the entire upper surface of these to further prevent the penetration of moisture.
  • the material, thickness, and formation method of the second thin film insulating layer 122 may be the same as those of the thin film insulating layer 22.
  • the permeation of moisture can be strongly prevented for the extraction electrode 41 by the three layers of the thin film insulating layer 22, the insulating resin 32, and the second thin film insulating layer 122. Since the two thin film insulating layers of the first thin film insulating layer 22 and the second thin film insulating layer 122 can be formed also on the surface where the seal material 26 comes into contact with the outside air, the seal material 26 is covered. Also for the part, the probability of pinhole occurrence and water permeability can be reduced. In addition, since both the first thin film insulating layer 22 and the second thin film insulating layer 122 are formed on the entire surface of the panel on the second substrate 6 side, there is no particular need for masking.
  • the polarizing plate 11 with a protective sheet attached as a protective film is bonded to the liquid crystal display panel.
  • the protective sheet may be peeled off at the time of inspection or when a liquid crystal display panel is used, and the thin film insulating layer on the polarizing plate 11 may be removed.
  • connection between the FPC 31 and the external circuit can be easily broken by external force of a connector or the like on the external circuit side to ensure electrical continuity. This is the same as in the embodiment.
  • FIG. 13 is a sectional view corresponding to FIG. 2 showing a section of the liquid crystal display panel.
  • parts corresponding to those of the first and second embodiments are denoted by the same reference numerals.
  • a feature of the seventh embodiment is that a coating is provided as a second insulating coating on an insulating resin. Except for this point, the liquid crystal display panel of the seventh embodiment is almost the same as the second embodiment described with reference to FIGS. 4 and 5, and therefore, except for the differences, Omit or simplify the description.
  • the thin insulating layer 22 and the insulating resin 32 are provided in the same manner as in the second embodiment.
  • the insulating resin 32 is provided by acryl resin.
  • a covering material 51 made of a polyethylene terephthalate (PET) film is placed on the insulating resin 32 and the FPC 31 is partially overlapped with a part of the second substrate 6. Provide up to the overlapping position.
  • the thickness of the coating material 51 is preferably about 50 ⁇ m to about 100 ⁇ m.
  • the thickness of the insulating resin 32 can be reduced by adjusting to the uneven shape of the driving ICs 35 and 36 on the first substrate 1, while the thin film insulating layer 22 Since it has a thickness of 100 times or more in comparison, the water permeability can be extremely reduced. Furthermore, it is robust against scratches.
  • the steps of forming the thin film insulating layer 22, the insulating resin 32, and the coating material 51 may be performed as follows. That is, first, the driving ICs 35 and 36 and the FPC 31 are mounted on the liquid crystal display panel, and then the thin film insulating layer 22 is formed. After that, the insulating resin 32 is applied, the covering material 51 is placed, and the pressure is applied to allow the insulating resin 32 and the covering material 51 to blend in, and then the insulating resin 32 is cured. At this time, it is more preferable to previously provide a thin-film insulating layer for waterproofing on the coating material 51 or to perform a surface treatment for improving the adhesion to the insulating resin 32.
  • the permeation of moisture into the extraction electrode 41 can be further reduced. Then, by using the thin film insulating layer 22 and the covering material 51 together, air bubbles are generated in the insulating resin 32, and the first substrate 1 and the second substrate 6 near the sealing material 26 are formed. Even if a portion where the adhesion of the thin-film insulating layer 22 or the insulating resin 32 is poor in the gap portion 53 or a pinhole occurs in the thin-film insulating layer 22, the coating material 51 is Very stable characteristics can be secured to compensate for the decrease in waterproofness.
  • FIG. 14 is a plan view of the liquid crystal display panel
  • FIG. 15 is a cross section taken along the line 15--15 shown in FIG.
  • FIG. 16 is a partially enlarged plan view enlarging the circle B in FIG.
  • parts corresponding to those in the first and second embodiments are denoted by the same reference numerals.
  • a feature of the eighth embodiment is that an insulating resin is provided on and around the extraction electrode provided on the first substrate, and a coating material is provided thereon as an insulating coating material. Since the basic configuration of this liquid crystal display panel is the same as that of the second embodiment described with reference to FIGS. 4 and 5, the description will focus on the differences and the other points will be briefly described. Or omit. First, in this liquid crystal display panel, unlike the case of the second embodiment, no thin-film insulating layer is provided. Then, as shown in FIGS. 14 to 16, the epoxy resin is blackened on and around the extraction electrode 41 so as to cover at least a portion of the extraction electrode 41 outside the sealing material 26. An insulating resin 33 made of a black epoxy resin having a dye is provided.
  • the insulating resin 33 is similarly provided on the driving ICs 35 and 36, a part on the FPC 31 and a part between the driving IC 35 and the FPC 31.
  • the insulating resin 33 is also provided between the drive ICs 35 and 36 and the seal material 26.
  • the extraction electrode 41 outside the sealing material 26 is covered, and the driving ICs 35, 36 and the FPC 3 are covered.
  • 1 is made of polycarbonate (PC), so that it overlaps with the portion between the drive ICs 35 and 36 and the FPC 31 and partially overlaps with the second substrate 6 at the outer periphery.
  • a coating material 51 is provided on the insulating resin 33 side in which a gas barrier layer made of a silicon oxide film and titanium oxide, a moisture blocking film, and a transparent conductive film are formed.
  • the covering material 51 partially overlaps the outer periphery of the second substrate 6 and is provided up to the region where the first substrate 1 overlaps with the portion of the first substrate 1 projecting to the FPC 31 side.
  • the covering material 51 is divided into a first portion provided on the side provided with the drive IC 35 and a second portion provided on the side provided with the drive IC 36. Although it is provided, it may be integrated.
  • the covering material 51 is provided up to a position where its end overlaps the sealing material 26.
  • a plate-like covering material 51 is provided like this liquid crystal display panel.
  • press the coating material 51 against the panel to bring the second substrate 6 and the coating material 51 closer together, reduce the thickness of the insulating resin 33, and see the moisture from the lateral direction in FIG. It is preferable to reduce the transmission cross section.
  • the panel, particularly the second substrate 6 receives stress, but by overlapping the end portion of the covering material 51 with the sealing material 26 as described above, The stress on the substrate 6 of 2 can be reduced to prevent the substrate from being damaged.
  • Examples of the material of the coating material 51 include, in addition to the PC described above, a plastic plate, a glass plate, a metal plate, a metal plate provided with an anodized layer as a second insulating coating material, a ceramic plate, or a laminate.
  • An adhesive can be used.
  • ceramics are preferable because of their high strength and low coefficient of thermal expansion.
  • a processable ceramic such as Corning's Macor glass (trade name)
  • a thin film ceramic or porcelain obtained by stretching alumina in a foil shape is preferable because of its high strength and low coefficient of thermal expansion.
  • processing similar to metal processing can be performed by using a photosensitive glass substrate manufactured by KONING.
  • a metal plate since the electromagnetic wave shielding ability is strong, a malfunction of the driving IC caused by noise can be prevented.
  • the covering material 51 is preferably made of a material having a thermal expansion coefficient equivalent to that of the substrate (here, the second substrate 6) in contact with the covering material 51. This can prevent the insulating resin from peeling off from the substrate when heated in a curing step or the like of the insulating resin.
  • the coating material 51 is made of the same glass as the substrate because the thermal expansion coefficient can be made equal to that of the substrate.
  • the thickness of the coating material 51 is preferably from about 50 Aim to about 700 ⁇ , but in the case of a plastic film, it is preferably from about 80 ⁇ m to about 150 ⁇ m.
  • the insulating resin 33 is also provided on the portion of the gap between the first substrate 1 and the second substrate 6 outside the sealing material 26, so that the first portion 1 Base When viewed from the plate 1 side, the first substrate 1, the insulating resin 33, the second substrate 6, and the covering material 51 overlap.
  • the insulating resin 33 and the covering material 51 are also provided on the driving ICs 35 and 36 and the FPC 31, the driving ICs 35 and 36 are viewed from the first substrate 1 side. It has a part that overlaps with 36 and FPC 31 as well. In the right part of FIG. 15, the insulating resin 33 protrudes from the outer periphery of the covering material 51.
  • the drive ICs 35, 36 and the FPC 31 are mounted on the panel body, then the insulating resin 33 is applied, and then the covering material 51 is disposed. Then, the insulating resin is preferably cured.
  • the first substrate 1 and the covering material 51 can be bonded by the insulating resin 33.
  • the coating material 51 when the coating material 51 is placed on the insulating resin 33 before curing, a part of the insulating resin 33 becomes part of the second substrate 6 and the coating material 5. Since the insulating resin 33 exudes between the second substrate 6 and the coating material 51, the insulating resin 33 exudes.
  • the covering member 51 and the insulating resin 33 maintain the airtightness of the portion where the extraction electrode 41 is provided, and can prevent the penetration of moisture into the extraction electrode 41.
  • the covering material 51 is provided so as to partially overlap the second substrate 6 and is bonded with the insulating resin 33, a gap through which moisture passes between the covering material 51 and the second substrate 6 is provided.
  • the permeation of moisture from this to the extraction electrode 41 can be excluded. Therefore, even when the electrode is operated for a long time in a high-temperature and high-humidity state, it is possible to prevent the extraction electrode 41 from being electrolytically corroded and to perform stable display.
  • the liquid crystal display panel is greatly enlarged in the vertical direction for the sake of illustration. If it is located at a position horizontally separated from the extraction electrode, that is, at a position that does not overlap with the extraction electrode when viewed from the first substrate 1 side, even if moisture enters there, if it enters from just above the extraction electrode 41 Compared to extremely long distances If it does not penetrate into the insulating resin 33, it does not reach the extraction electrode 41. Therefore, in such a position, even if there are some gaps or openings in the coating material 51, it is permissible from the viewpoint of preventing the penetration of moisture.
  • the extra insulating resin 33 can be discharged from between the two coating materials, and the distance between the substrate and the coating material 33 can be reduced. It is also advantageous if bubbles generated in the insulating resin 33 can be removed from this gap. However, it is desirable that the position of the gap be as far as possible from the region where the extraction electrode 41 is formed.
  • the coating material 51 it is easy to thicken the insulating resin 33, and the water permeability can be reduced accordingly.
  • the coating material 51 is not a film formed by coating and has a large thickness, pinholes are extremely small, and the reliability of preventing moisture penetration is high.
  • FIG. 17 is a sectional view corresponding to FIG. 15 showing a section of the liquid crystal display panel.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • a feature of the ninth embodiment is that a second polarizing plate is provided on a second substrate.
  • the liquid crystal display panel according to the ninth embodiment is the same as the above-described eighth embodiment except for these points and the point that the reflection plate 16 is not provided. Make it easy.
  • this liquid crystal display panel does not have a reflection plate, but has a second polarizing plate 14 on the back side (the lower side in the figure) of the second substrate 6.
  • the covering member 51 and the second polarizing plate 14 are arranged on the second substrate 6 with a predetermined gap.
  • both an absorbing polarizing plate and a reflecting polarizing plate can be used.
  • a scattering layer and a reflecting plate may be provided together with the second polarizing plate 14, and these composite layers may be formed on the back side of the second substrate 6.
  • the insulating resin 33 that bonds the coating material 51 becomes Leakage from the gap between the second substrate 6 and contamination of the second polarizing plate 14 can be prevented.
  • RDF-C reflection type polarizing plate, RDF-C (product name) manufactured by Threeem, as the second polarizing plate 14, this polarizing plate is formed by laminating layers with different refractive indexes in multiple layers.
  • each layer is separated, and the polarization may be disturbed.
  • a slight gap is provided between the second polarizing plate 14 and the coating material 51, it is possible to prevent the external force from the clothing material 51 from acting on the second polarizing plate 14 This is effective for improving the reliability of the polarizing plate 14 and preventing a decrease in display quality.
  • FIG. 18 is a sectional view corresponding to FIG. 15 showing a section of the liquid crystal display panel.
  • parts corresponding to those in the eighth and ninth embodiments are denoted by the same reference numerals.
  • a feature of the tenth embodiment is that the second polarizing plate provided on the second substrate is also used as an insulating coating material. Except for this point, the liquid crystal display panel of the tenth embodiment is the same as that of the ninth embodiment described above, and therefore, the description other than the differences will be omitted or simplified.
  • an independent coating material 51 is not provided, and instead, a second polarizing plate 14 provided on the back side of the second substrate 6 is provided with a coating material.
  • a material that reaches the position where the material is to be provided is used as the insulating coating material.
  • the adhesion between the second substrate 6 and the second polarizing plate 14 is performed by an adhesive layer.
  • the second polarizing plate 14 is not used as a separate body on the side provided with the drive IC 35 and the side provided with the drive IC 36, but is used as a covering material for the body.
  • the manufacturing process can be shortened.
  • the adhesive layer used for bonding the second polarizing plate 14 and the second substrate 6 should be provided at a portion corresponding to the extraction electrode 41.
  • a method may be adopted in which the insulating resin 33 that exudes between the second substrate 6 and the second polarizing plate 14 is used for bonding.
  • a gas barrier layer or a water blocking film is formed on the second polarizing plate 14, whereby a more preferable structure can be provided for preventing the extraction electrode 41 from being electrically eroded. .
  • a transparent and optically isotropic material is used as the insulating resin 33. Even if the insulating resin 33 protrudes to the display area side, the influence on the display quality can be prevented.
  • the second polarizing plate 14 provided below the second substrate 6 also as a coating material, it is possible to prevent electrolytic corrosion of the extraction electrode 41 and to increase the display area and reduce the weight. This makes it possible to provide a liquid crystal display panel with good reliability and display quality.
  • a scattering layer and a reflection plate are provided together with the second polarizing plate 14 so that these composite layers are formed on the back side of the second substrate 6 or a multilayer structure such as RDF-C (product name) is formed.
  • RDF-C product name
  • FIG. 19 is a sectional view corresponding to FIG. 15 showing a section of the liquid crystal display panel.
  • parts corresponding to those in the eighth and ninth embodiments are denoted by the same reference numerals.
  • the eleventh embodiment is a development of the tenth embodiment described above.
  • the feature of the eleventh embodiment is that the second polarizing plate provided on the second substrate is used as an insulating coating material, Bias of The point is that a coating material is provided as a second insulating coating on the light plate, and the second insulating resin is provided on the extraction electrode.
  • the liquid crystal display panel of the eleventh embodiment is the same as the tenth embodiment described above except for these points. Therefore, the description of the points other than the differences will be omitted or simplified.
  • a second polarizing plate 14 provided on the back side of the second substrate 6 is used in such a size as to reach the position where the covering material is provided.
  • the coating material 51 the side where the drive IC 35 is provided and the side where the drive IC 36 is provided may be separate or integrated.
  • the coating material 51 is provided on the second polarizing plate 14 as described above, the coating material 51 is provided on a substantially flat surface. 5 1 can be glued. And, of course, the insulating resin 33 does not seep into the display area when the covering material 51 is bonded.
  • the second insulating material having a lower viscosity than the insulating resin 33 is provided on and around the extraction electrode 41 in a portion between the driving ICs 35 and 36 and the sealing material 26.
  • Insulating resin 34 is provided, and two kinds of insulating resins of insulating resin 33 and second insulating resin 34 are provided.
  • the portion between the drive ICs 35, 36 and the sealing material 26, particularly the portion of the gap between the first substrate 1 and the second substrate 6 outside the sealing material 26, is narrow and has insulating properties. Since it is considered that the resin 33 cannot be applied well, the use of the second insulating resin 34 having a lower viscosity allows easy and reliable application even in a narrow space.
  • the curing of the second insulating resin 34 may be performed before the application of the insulating resin 33 or may be performed simultaneously in the curing step of the insulating resin 33.
  • the second insulating resin 3 4 is also effective to use a material that can be cured in a short time and apply it on the extraction electrode 41 to block moisture to some extent.
  • the two layers of the covering material and the two layers of the insulating resin can surely prevent moisture from penetrating into the extraction electrode 41 and prevent electrolytic corrosion.
  • FIG. 20 is a partially enlarged plan view corresponding to FIG. 16 showing a part of the liquid crystal display panel
  • FIG. 21 is a partial cross-sectional view taken along line 21--21 shown in FIG.
  • FIG. 3 is a partial cross-sectional view showing the above in a reversed manner.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • the feature of the 12th embodiment is that a first covering material having a flat plate shape and a second covering material having a U-shaped cross section are provided as insulating covering materials.
  • the liquid crystal display panel of the 12th embodiment is the same as the eighth embodiment described with reference to FIGS. 14 to 16 except for this point. Omit or simplify.
  • the liquid crystal display panel has a first coating material 29 and a second coating material 30 as insulating coating materials provided on the insulating resin 33. Is provided.
  • the first covering material 29 is the same as the covering material 51 in the eighth embodiment, and has a flat plate shape.
  • the position of the second covering material 30 is almost the same, but the second covering material 30 is provided only on the side where the second covering material 30 is provided to a position slightly away from the end of the first substrate 1 so as not to overlap with the second covering material 30. Not.
  • a second covering material 30 having a U-shaped cross section is provided as shown in FIG.
  • the material and thickness are the same as those of the first covering material 29.
  • the second coating material 30 has only the first substrate 1 appearing in the cross section of FIG. 21, the first coating 1 is sandwiched between the first substrate 1 and the second substrate 6 inside the U-shape.
  • the second covering material 30 is adhered to the first substrate 1 by the insulating resin 33.
  • the insulating resin 33 is slightly wrapped around the side opposite to the side where the drive IC 35 is provided, and the same wraparound occurs on the second substrate 6.
  • 30 is also bonded to the second substrate 6.
  • reference numeral 63 denotes a polyimide resin constituting an anisotropic conductive film used for connection between the extraction electrode 41 and the driving IC 35
  • reference numeral 64 denotes a polyimide resin. The conductive particles contained therein.
  • the second covering material 30 as described above, it is possible to prevent the insulating resin 33 from dripping from the end of the first substrate 1. Also, since the insulating resin 33 can be pressurized by the first coating material 29 and the second coating material 30, the first substrate 1 and the second substrate near the sealing material 26 are formed. The insulating resin 33 can also be efficiently applied to the narrow gap 53 with the gap 6. At this time, the excess insulating resin 33 extruded by the pressurization can escape to the insulating resin gap 67, the wrap-around part 52 along the sealing material 26, and the protruding part 55. .
  • the insulation between the first substrate 1 and the second substrate 6 near the seal material 26 and the gap is provided.
  • the applicability of the resin 33 is greatly improved, and air bubbles generated during curing of the insulating resin and excess insulating resin can be released, so that the airtightness of the extraction electrode 41 can be easily improved and the extraction electrode 4 1 Water permeability can be greatly reduced.
  • FIG. 22 is a sectional view corresponding to FIG. 15 showing a section of the liquid crystal display panel.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • a feature of the thirteenth embodiment is that insulating resins are provided on both sides of the FPC.
  • the liquid crystal display panel according to the thirteenth embodiment is almost the same as the eighth embodiment described with reference to FIGS. 14 to 16 except for this point, and therefore, the description will be given except for the difference. Omit Or simple.
  • the insulating resin is provided at the same position as in the eighth embodiment, but is provided on the FPC 31 in a slightly wider portion.
  • the insulating resin 32 is formed using a transparent ultraviolet-curable epoxy resin or ultraviolet-curable acryl resin as the resin. Since the ultraviolet curable resin can be cured in a short time, use of the resin can prevent the coating material 51 from moving during curing.
  • the FPC insulating resin 49 is also provided on the first substrate 1 side (the upper side in FIG. 22) of the FPC 31.
  • the adhesive strength with the FPC may be weak, and therefore, in order to achieve mechanical strength, an epoxy resin or an acryl resin is preferable.
  • FIG. 23 is a cross-sectional view corresponding to FIG. 15 showing a cross section of the liquid crystal display panel
  • FIG. 24 is a perspective view showing a shape of a covering material provided on the liquid crystal display panel.
  • parts corresponding to those of the eighth embodiment are denoted by the same reference numerals.
  • the 14th embodiment is a development of the above-described 12th embodiment, and is characterized in that a covering material having the shape shown in FIG. 24 is used.
  • the liquid crystal display panel according to the fourteenth embodiment is the same as the above-described first embodiment except for these points. Therefore, the description other than the differences will be omitted or simplified.
  • the covering material is shown upside down from the state shown in FIG.
  • the coating material 15 1 used for the liquid crystal display panel is as follows.
  • the first substrate 1 and the second substrate 6 have such a shape that they cover the ends on the side from which the extraction electrodes 41 are extracted. And its cross section is U-shaped.
  • an FPC hole 57 is provided in order to take the FPC 31 out of the covering material 151, and furthermore, the insulating resin 33 from the FPC hole 57 becomes large to the outside.
  • An FPC hole flange 59 is provided so as not to protrude.
  • the covering material 151 has an introduction hole 58 as an opening for introducing an insulating resin.
  • the introduction hole 58 is preferably provided in a portion that does not overlap with the extraction electrode 41 or the connection electrode 42 when viewed from the first substrate 1 side. In this way, the influence of the absence of the covering material at the introduction hole 58 can be minimized.
  • the inside of the covering material 151 is not shown, but the covering material 151 may be transparent. It is preferable to be transparent because it is easy to check the applied state of the insulating resin 33 and the generation of air bubbles.However, in order to shield the drive ICs 35 and 36 from light, a light-shielding black Is preferred. Therefore, the surface on which the extraction electrode is provided is preferably transparent, and the surface on the opposite side of the driving ICs 35 and 36 and the first substrate 1 is preferably black.
  • such a coating material 15 1 is formed by placing the first substrate 1 and the second substrate 6 inside the U-shaped cross section as shown in FIG. Attach so that it is sandwiched. At this time, the covering material 15 1 is fitted until the side surface of the first substrate 1 contacts the covering material 15 1. After that, the insulating resin 33 is filled from the introduction hole 58. At this time, the surplus insulating resin 33 is partially discharged from the FPC hole 57 and further discharged from the introduction hole 58 not used for introducing the insulating resin 33. Thereafter, bubbles generated when the insulating resin 33 is cured can be similarly discharged. Then, the insulating resin 33 slightly rises from the introduction hole 58.
  • a groove 60 for the substrate is provided on the side surface of the coating material 151, and the first substrate 1 is fitted therein, and the side surface of the coating material 15 It is located inside the end of the substrate 1.
  • the position of the side surface of the coating material 15 1 is outside the end of the first substrate 1, it is not necessary to provide the substrate groove 60, and the second substrate In the case where the second substrate 6 is located inside the end of the substrate 6, it is necessary to provide a substrate groove into which the second substrate 6 is fitted.
  • a continuous coating material 15 1 is provided on the upper and lower sides of the first substrate 1, so that the shrinkage stress or the expansion when the insulating resin 33 is hardened. Even when stress is generated, the stress is not concentrated on one side, and the warpage of the substrate can be prevented. Furthermore, since the covering material 151 is in contact with both the first substrate 1 and the second substrate 6, the covering material 151 makes it possible to reinforce the substrate.
  • the coating material 15 1 is in contact with the insulating resin 33 and shuts off the outside air even on a surface perpendicular to the first substrate 1, the airtightness of the extraction electrode 41 becomes extremely robust. Therefore, the structure is very effective for preventing electrolytic corrosion.
  • FIG. 25 is a partially enlarged plan view corresponding to FIG. 16 showing a part of the liquid crystal display panel
  • FIG. 26 is a sectional view corresponding to FIG. 15 showing a cross section of the liquid crystal display panel. .
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • the feature of the fifteenth embodiment is that when the gap between the substrates is narrow and the insulating resin 33 cannot be sufficiently applied thereto, the gap is filled with a second insulating resin having a low viscosity. is there.
  • the liquid crystal display panel of the fifteenth embodiment is almost the same as the eighth embodiment described with reference to FIGS. 14 to 16 except for this point. Is omitted or simplified.
  • the liquid crystal layer 25 employs ferroelectric liquid crystal, its thickness is about 1 ⁇ , and accordingly, the gap between the first substrate 1 and the second substrate 6 is also small. Only that much.
  • the insulating resin may not enter between the first substrate and the second substrate.
  • an insulating resin with low viscosity it will flow during application, and if it is applied over a large area, it can be filled to a height that reaches the coating material 51. Absent.
  • the resin used as the insulating resin 33 in the eighth embodiment and the like it is very difficult to fill the gaps as thin as 1.
  • the insulating resin 33 used in the eighth embodiment and the like is applied first, and the coating material 5 is applied. Place 1. Then, as shown in FIG. 25, there is a space portion 39 in which the insulating resin 33 cannot be filled. Thereafter, the insulating material 51 is insulated from near the end of the covering material 51 so as to seal the space portion 39.
  • the second insulating resin 34 having a lower viscosity than the resin 33 is filled. The low-viscosity second insulating resin 34 can be easily filled into the space 39 by capillary action, and it can cover the extraction electrode 41 to prevent moisture penetration. it can.
  • the driving IC 35 since the driving IC 35 has a high height, the driving IC 35 is lower than the second substrate 6 in the drawing. It is in a state of protruding. Then, when the insulating resin 33 is provided, and the covering material 51 is disposed thereon, and then the insulating resin 33 is thermally cured, the insulating resin 33 thermally contracts. When the coating material 51 is pulled toward the first substrate 1 due to this heat shrinkage, the coating material 51 may be concealed by the drive IC 35, but the coating material 51 has the shape of the drive IC 35 even in such a case. It is preferable to use a flexible material which deforms accordingly and can maintain the close contact with the insulating resin 33. [Embodiment 16: FIGS. 27 and 28]
  • FIG. 27 is a plan view of a liquid crystal display panel of a modified example thereof
  • FIG. 28 is a cross-sectional view taken along line 28-28 shown in FIG.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • a feature of the sixteenth embodiment is that the covering material is a black member, and the covering material is used as a parting liquid crystal display panel.
  • This liquid crystal display panel has a first substrate and a second substrate Although the vertical relationship is reversed, it looks very different from that of the eighth embodiment, but since the basic configuration has many common points, the description of the common points is omitted or simplified. .
  • the upper side in FIG. 30 is the viewing side
  • the second substrate 6 is on the viewing side
  • the first substrate 1 is on the opposite side. It is located.
  • the reflector 16, the color filters 17, 18, 19, and the flattening protective film 21 are provided on the surface of the first substrate 1 on the side of the liquid crystal layer 25, and the polarizing plate 11 and the retarder 1 2 is arranged on the viewing side of the second substrate 6.
  • the extraction electrode 41, the driving ICs 35, 36, and the FPC 31 are provided on the surface of the first substrate 1 on the liquid crystal layer 25 side as in the eighth embodiment.
  • the insulating resin 33 made of a black epoxy resin having a black dye in the epoxy resin is provided in a region including the black resin.
  • a coating material 101 is provided on the insulating resin 33 as an insulating coating material.
  • the coating material 101 is formed by kneading a black pigment into a resin and processing it into a sheet.
  • the outer and inner contours are formed by stamping with a press.
  • this coating material 101 was disposed on a polarizing plate 11 provided on a second substrate 6, and as shown in FIG. Is provided not only on the side where the is provided, but also on the entire periphery of the second substrate 6, and is used as a parting-off to clearly show the display area 23 by shielding the outside of the display area 23.
  • This covering material 101 is bonded to the first substrate 1 and the second substrate 6 (actually, the polarizing plate 11 1 thereon) by the insulating resin 33 as in the case of the eighth embodiment.
  • a small amount of insulating resin 33 is also provided on the second substrate 6 on the side where the driving ICs 35 and 36 are not provided, and the coating material 101 and the second substrate are also provided on this portion. 6 and glue.
  • the polarizing plate 1 This prevents the permeation of moisture into the polarizing plate 1 and improves the reliability of the polarizing plate 11.
  • a transparent coating material may be used, and a method of forming a parting by applying an insulating resin 33 to the outside of the display area by an ink jet method or a printing method may be considered. It is possible to easily obtain high positional accuracy by using.
  • FIG. 29 is a sectional view corresponding to FIG. 15 showing a section of the liquid crystal display panel.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • a feature of the seventeenth embodiment is that a part of the FPC is used as an insulating coating material.
  • the liquid crystal display panel of the seventeenth embodiment is the same as the eighth embodiment described with reference to FIGS. 14 to 16 except for this point. Omit or simplify the description.
  • FIG. 30 is a sectional view corresponding to FIG. 15 showing a section of the liquid crystal display panel.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • a feature of the eighteenth embodiment is that a thin-film insulating layer is further provided as a second insulating covering material on the covering material.
  • the liquid crystal display panel of the eighteenth embodiment is the same as the above-described eighth embodiment except for this point, and therefore, the description other than the difference will be omitted or simplified.
  • a thin film insulating film is formed on the FPC 31, the insulating resin 33, the coating material 51, and the second substrate 6 so as to cover these members.
  • Layer 22 is provided.
  • the material, thickness, and forming method are the same as those in the first embodiment.
  • the three members of the thin film insulating layer 22, the covering material 51, and the insulating resin 33 can prevent moisture from penetrating into the extraction electrode 41, and the occurrence of electrolytic corrosion is extremely strong. Can be prevented. In particular, when a gap or an opening is provided in the coating material 51, the effect of such a configuration is great.
  • FIG. 31 is a plan view of the liquid crystal display panel.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • a feature of the nineteenth embodiment is that a portion overlapping the driving IC of the coating material is colored black. Except for this point, the liquid crystal display panel of the nineteenth embodiment is also substantially the same as the eighth embodiment described above, and therefore, the description other than the differences will be omitted or simplified.
  • a transparent insulating resin 32 is provided, and the covering material 51 overlaps the driving ICs 35, 36 when viewed from the first substrate 1 side.
  • the portion is a colored portion 71, and is colored black so as to absorb light in the ultraviolet wavelength region and the visible light wavelength region.
  • the coating material 51 is made of a plastic film, and the colored portion 71 is impregnated with a black pigment.
  • the driving ICs 35 and 36 can be shielded from light, and malfunctions due to light of the IC can be prevented. Also, the colored part 7 1 The positioning of the covering material 51 as a mark with respect to the panel can be easily performed.
  • thermosetting resin is preferably used as the insulating resin 32.
  • Insulating resin 33 may also be applied to the portion of the first substrate 1 opposite to the side on which the drive ICs 35, 36 are provided and corresponding to the drive ICs 35, 36. It is preferable to form a light-shielding portion. In this way, light to the driving ICs 35 and 36 can be shielded from both sides, and it is more effective to prevent malfunction of the IC.
  • FIG. 32 is a plan view of the liquid crystal display panel
  • FIG. 33 is a cross-sectional view taken along line 33-33 shown in FIG.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • the feature of the 20th embodiment is that an outer peripheral wall for preventing the outflow of the insulating resin is provided. Except for this point, the liquid crystal display panel of the 20th embodiment is also substantially the same as the eighth embodiment described above, and therefore, the description of the portions other than the differences will be omitted or simplified.
  • an outer peripheral wall 73 is provided on a first substrate 1.
  • the outer peripheral wall 73 is made of resin, and is adhered to the first substrate 1 by an outer peripheral wall adhesive layer 74 made of epoxy resin or double-sided tape.
  • the position where the outer peripheral wall 73 is provided is the outer peripheral portion of the region where the insulating resin 33 is provided.
  • the insulating resin 33 covers the extraction electrode 41 connected to the drive IC 35. And a portion for covering the extraction electrode connected to the driving IC 36.
  • the outer peripheral wall 73 is attached to the first substrate by the outer peripheral wall adhesive layer 74. It is good to fix to 1 and then apply the insulating resin 33 to the necessary parts. At this time, bubbles are generated from the gap between the first substrate 1 and the second substrate 6 and from the vicinity of the driving ICs 35 and 36. In order to remove the resin, it is preferable to allow the resin to slightly overflow from the outer peripheral wall 73. After that, the coating material .51 is placed on the insulating resin 33, pressurized, and heat-treated to cure the resin, thereby completing the liquid crystal display panel.
  • the outer peripheral wall 73 By providing the outer peripheral wall 73 in this way, it is possible to prevent the resin from flowing out to unnecessary parts in the step of applying the insulating resin 33 and from dripping or protruding from the outer periphery of the first substrate 1. be able to. Further, by providing the outer peripheral wall 73, the flow of the resin at the outer peripheral portion of the second substrate 6 can be improved.
  • the outer peripheral wall 73 may be provided up to a height in contact with the covering material 51 as shown in FIG. FIG. 32 shows an example in which three rectangular parallelepiped members and one L-shaped member are provided as the outer peripheral wall 73, but the number and shape of the outer peripheral walls are not limited to this. Absent. Further, the outer peripheral wall 73 may be formed directly on the first substrate 1 by a dispenser. [Embodiment 21: Figs. 34 to 36]
  • FIG. 34 is a plan view of the liquid crystal display panel
  • FIG. 35 is a cross-sectional view taken along the line 35-35 shown in FIG. 34
  • a feature of the twenty-first embodiment is that an opening is provided in the covering material. Except for this point, the liquid crystal display panel of the twenty-first embodiment is almost the same as the eighth embodiment described above, and therefore, the description of the points other than the differences will be omitted or simplified.
  • a plurality of openings 79 are provided in a covering material 51.
  • the opening 79 is for discharging excess resin and bubbles 80 when the insulating resin 33 is applied.
  • the insulating resin 33 can be prevented from protruding significantly outside the opening 79. This is because a part of the insulating resin 33 flows out together with the bubbles 80 from the opening 79, and the progress of the insulating resin 33 stops near the opening 79. The resin that has flowed out at this time may be wiped off before curing or scraped off after curing. Therefore, the opening 79 can also be used to determine a rough application position of the insulating resin 33.
  • the opening 79 is provided so as not to overlap with the extraction electrode 41 and the connection electrode 42 when viewed from the first substrate 1 side. The effect of the absence of coating on the part can be minimized.
  • a cap covering material 77 covering the opening 79 on the opening 79.
  • the cap covering material 77 can prevent moisture penetration even at the position of the opening 79, so that the opening 7 9
  • the opening 79 is provided at an arbitrary position, so that the insulating resin 33 can be effectively injected and bubbles can be effectively discharged.
  • the drive ICs 35 and 36 are shielded from light, and malfunction can be prevented.
  • FIG. 37 is a plan view of the liquid crystal display panel.
  • parts corresponding to those in the eighth embodiment are denoted by the same reference numerals.
  • the feature of the second embodiment is that the coating material is provided separately for each driving IC. Except for this point, the liquid crystal display panel of the twenty-second embodiment is almost the same as that of the above-described eighth embodiment. Therefore, the description other than the difference will be omitted or simplified.
  • the insulating resin 33 is provided separately for each driving IC, and the insulating coating material is each coating material 5 1 ′ divided for each driving IC. Provided. In conjunction with this, the routing position of the extraction electrode was also changed, and outside the sealing material 26, between the two drive ICs 35, the part where the insulating resin 33 and the coating material 51 ′ were not provided. Is not routed around.
  • the covering material on one side of the substrate is divided and provided as in this liquid crystal display panel, there may be a difference in the thermal expansion coefficient between the covering material 51 'and the substrate, Even when the resin 33 undergoes thermal contraction or thermal expansion, it reduces the stress acting on the insulating resin 33, prevents breakage and peeling from the second substrate 6, and provides stable water permeability. It can be kept low. In addition, discharge of bubbles generated in the insulating resin 33 and application of the insulating resin 33 become easy.
  • FIG. 38 is a cross-sectional view corresponding to FIG. 15 showing a cross-section of a liquid crystal display panel of the modified example.
  • the first modified example is an example in which the present invention is applied to an active matrix type liquid crystal display panel using a thin film transistor (TFT) and a drive IC provided on an FPC.
  • TFT thin film transistor
  • FPC drive IC
  • a TFT is provided on the first substrate 1 as a switching element, so that the first substrate 1 is disposed on the lower side, and the second substrate 6 is disposed on the upper side. Have been placed.
  • a semiconductor layer (not shown) containing impurity ions is provided between the source electrode 84 and the drain electrode 85 and the semiconductor layer 83.
  • a black matrix 8 for preventing leakage from the outer periphery of the color filter and cutting off the periphery of the display area, and a red (R) color filter are provided on a second substrate 6 opposite to the first substrate 1.
  • a color filter consisting of 17, green (G) color filter 18 and blue (B) color filter (not shown).
  • a flattening protective film 21 is provided on the color filter, and a second electrode 7 made of a transparent conductive film is provided on the flattening protective film 21.
  • an intersection between the drain electrode 85 and the second electrode 7 which also serves as a display electrode connected to TFT is a pixel portion.
  • an alignment film (not shown) is provided on the surface of the first substrate 1 and the second substrate 6 on the liquid crystal layer 25 side to align the liquid crystal molecules of the liquid crystal layer 25 in a predetermined direction. .
  • the liquid crystal display panel is a transmissive liquid crystal display panel in which an auxiliary light source (not shown) is arranged below the first substrate 1. And a second polarizing plate 14 is provided on the second substrate.
  • an extraction electrode 41 connected to the gut electrode 81 or the source electrode 84 provided on the first substrate 1 is provided on the first substrate 1 having a larger outer shape than the second substrate 6, and a sealing material 2 is provided. Pulled out of 6 and connected to FPC 31.
  • the drive IC 35 is mounted on the FPC 31, and the periphery of the mounting portion is covered with a tape “auto carrier” bonding (TAB) resin 69.
  • TAB tape “auto carrier” bonding
  • the sealing material 26 of the extraction electrode 41 is formed on and around the extraction electrode 41.
  • Insulating resin 33 is provided so as to cover.
  • some parts on FPC 31 Similarly, an insulating resin 33 is provided.
  • the second polarizing plate 14 provided on the second substrate 6 has a size large enough to reach the insulating resin 33, and is used as an insulating coating material.
  • a covering material 51 is provided on 14.
  • an active matrix type liquid crystal display panel as in this modification can use metal for the material of the extraction electrode 41. It is possible, and it is also possible to cover a part of the extraction electrode 41 with an insulating film constituting the switching element, so that a configuration resistant to electrolytic corrosion can be provided.
  • the water permeation prevention structure as in the above-described embodiments is applied to the active matrix type liquid crystal display panel in this manner, moisture from the portions where the pinholes and cracks are generated in the insulating film and the FPC 31 are removed. It prevents penetration, and can further prevent galvanic corrosion. '
  • FIG. 39 is a cross-sectional view corresponding to FIG. 2 showing a cross-section of a liquid crystal display panel of the modified example.
  • the second modification is an example in which the present invention is applied to a liquid crystal display panel having a configuration in which an FPC is directly connected to an extraction electrode.
  • FIG. 39 shows an example in which the modification is applied to the second embodiment. It is shown.
  • the drive IC is not mounted on the first substrate, the FPC 31 is directly connected to the extraction electrode 41, and the drive IC is separately provided via the FPC 31. It can also be applied to a liquid crystal display panel.
  • FIG. 40 is a cross-sectional view corresponding to FIG. 15 showing a cross-section of a liquid crystal display panel of the modified example.
  • FIG. 40 shows a modification to the eighth embodiment. This is an example of applying.
  • the outer shape of the second substrate 6 is made to match the outer shape of the sealing material 26 at least on the side from which the extraction electrode 41 is extended. It is good to do so.
  • An insulating resin or a thin-film insulating layer is provided on the side from which the extraction electrode 41 is drawn out according to the features of each embodiment.
  • the first substrate 1 is provided outside the sealing material 26. Since the narrow gap between the first substrate and the second substrate 6 can be eliminated, it is not necessary to form them in the narrow gap, and the formation is facilitated.
  • thermal expansion or thermal compression occurs in the insulating resin provided in the gap between the first substrate 1 and the second substrate 6 to deform the substrate, and the width of the gap, that is, the thickness of the liquid crystal layer 25 Since the display is not adversely affected by changing the image quality, the display quality can be improved.
  • the present invention can be applied to a liquid crystal display panel using a guest host liquid crystal, a scattering liquid crystal, or a fluorescent liquid crystal, which can display without using a polarizing plate.
  • a transparent film having an ultraviolet light absorbing material or an ultraviolet light reflecting material may be used.
  • the COG method of mounting the drive IC on the board has been described.
  • the present invention is a countermeasure against electrolytic corrosion when using the TAB mounting method, the COB mounting method, and the COF mounting method. Is naturally effective.
  • the thin insulating layer prevents moisture from penetrating into the drive IC, which is also effective in protecting circuits around the drive IC.
  • the chip components and the connection portion are formed by a thin film insulating layer. If coating is performed at the same time as the extraction electrode, it is possible to prevent corrosion and electric corrosion of the chip component and the connection portion while preventing the extraction electrode from being corroded.
  • controlling the refractive index of the thin-film insulating layer can reduce the surface reflectance, thereby improving the display quality of a liquid crystal display panel. it can.
  • the sealing material of the extraction electrode covers the outer part, and the insulating coating material is provided so as to partially overlap the second substrate.
  • the insulating coating material is provided so as to partially overlap the second substrate.
  • a liquid crystal display panel of the present invention According to the method of manufacturing a liquid crystal display panel of the present invention, such a liquid crystal display panel can be easily manufactured.

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CN1292299C (zh) 2006-12-27
JPWO2003003108A1 (ja) 2004-10-21
JP4181495B2 (ja) 2008-11-12
US20040046909A1 (en) 2004-03-11
US7019809B2 (en) 2006-03-28

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